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  1. Brake Actuator
  2. Demco
  3. Surge Brake Actuator
  4. Drum Brakes
  5. Channel Only
  6. 8000 lbs GTW
Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs

Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs

Item # DM8759933
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Brake Actuator
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DM8759933 - Straight Tongue Coupler Demco Brake Actuator
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Surge actuator has a corrosion-resistant composite master cylinder. Manual lockout keeps brakes from actuating when in reverse. Mount coupler attachments (sold separately) in 1 of 3 positions on channel. Weld-on application. Call 800-298-1624 to order Demco brake actuator part number DM8759933 or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs. Brake Actuator reviews from real customers.
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  • Reviews (4)
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Demco Brake Actuator - DM8759933

  • Surge Brake Actuator
  • Drum Brakes
  • Channel Only
  • 8000 lbs GTW
  • Weld-On
  • Manual Lockout
  • Demco
  • Straight Tongue Coupler

Surge actuator has a corrosion-resistant composite master cylinder. Manual lockout keeps brakes from actuating when in reverse. Mount coupler attachments (sold separately) in 1 of 3 positions on channel. Weld-on application.


Features:

  • Hydraulic actuator activates trailer's brakes when tow vehicle slows or stops
  • Manual reverse lockout lets you reverse without actuating your trailer's brakes
    • Rotate tab on actuator to left before backing up to activate lockout
  • Adjustable channel has 3 different mounting positions for coupler (sold separately)
    • Channel-down design allows for greater drop
  • Composite master cylinder is durable and efficient
    • Glass-reinforced nylon construction resists rust and corrosion
    • Large reservoir provides increased capacity for brake fluid
    • Automotive-style diaphragm cap creates completely enclosed system to help prevent contamination of fluid
  • Acetal copolymer lining provides smooth operation as actuator telescopes in and out
  • Breakaway included
  • Heavy-duty steel construction
  • Primed finish
  • Weld-on installation
  • Made in the USA


Specs:

  • Application: trailers with hydraulic drum brakes
  • Gross towing weight: 8,000 lbs
  • Maximum tongue weight: 800 lbs
  • Channel width: approximately 3"
  • Channel height: 8"
  • Mounting: straight, 3" wide trailer tongue
  • Model number: DA91
  • 1-Year warranty


When you apply the brakes in your tow vehicle, deceleration occurs and momentum pushes your trailer toward the rear of your vehicle. With surge brake systems, the hydraulic actuator is triggered as your trailer moves forward, once your tow vehicle starts to slow down. When this happens, the actuator contracts, applying force to its master cylinder. This in turn supplies the necessary hydraulic pressure to engage your trailer's brakes.


Manual Reverse Lockout

This actuator has a manual reverse lockout that you can activate so that you can back up without triggering your trailer's disc brakes. To activate the lockout, just rotate the tab on the side of the actuator to the left. Once the lockout has been activated, you can back up your trailer without triggering the trailer brakes. Always remember to restore the tab to its original position before towing normally.


Adjustable Channel Design

The adjustable channel on this trailer brake actuator allows for ultimate versatility. Mount almost any type of coupler (sold separately) - from a standard ball coupler to a lunette ring or clevis attachment - to fit your specific application. In addition, the 3 mounting positions on the channel let you adjust the height of the coupler. Just place the coupler so that it matches the height of the ball mount or other hitch attachment on your tow vehicle and you will be able to tow your trailer levelly.


This actuator is great for tall trailers. This is because the adjustable channel is positioned so that the mounted coupler can sit below the actuator tube, allowing for a greater drop than with a standard center-mounted channel. As a result, you can line up your tall trailer with your tow vehicle's hitch for a level setup.



8759933 Demco DA91 Hydraulic Trailer Brake Actuator for Drum Brakes - Channel Down - 8,000 lbs





Video of Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of Demco Brake Actuator - Surge Brake Actuator - DM8759933

Jeff: Hello everybody. This is Jeff at etrailer.com. Today we're going to take a look at this Demco eight inch adjustable Channel-down Hydraulic Drum Brake actuator, with the manual lockout and an 8,000 pound capacity. Now this hydraulic actuator will activate your trailer's brakes when your tow vehicle slows or stops. Basically what happens is when you apply the brakes in your tow vehicle, deceleration will occur and the momentum will push your trailer toward the rear of your vehicle. So with a surge brake system, this actuator is triggered as your trailer moves forward, once the tow vehicle starts to slow down.

And when this happens, the inner slide portion right here of the actuator will actually contract inside the outer portion and it applies force to this master cylinder in the back right here. And then that'll in turn supply the necessary hydraulic pressure to engage your trailer's brakes.Now this one. I want to zoom in a little bit. This one will have a nice acetal copolymer lining around the whole inner slide here, provides a nice, smooth operation as the inner slide will telescope in and out. We mentioned its adjustable channel design.

You can see it has the three different mounting positions for your coupler. Now the coupler is not included, that we do sell separately on our website. And as we mentioned, this one's a channel-down design, you can see the channel is mostly down and that'll allow for a greater drop. Now it does include this reverse lockout right over here. And what that do it's a manual reverse lockout, so you actually manually have to set it.

But what it will do is the electric reverse, go in reverse without actuating your trailer's brakes, because when you go in reverse, you don't want the brakes to be applied.So all you have to do with the manual lockout is just lift up on this tab, move it over and put it on the little ledge there. And you can see that tab when it goes. the center slide goes to go back. that tab here will keep it from going back and that'll allow the brakes not to be applied and allow you to go in reverse. And then when you're done, when you're ready to go forward, just remove the tab and let it drop down and it'll hang right on the bolt here.

This is a heavy duty steel construction. You can see it has a nice prime finish to it. We mentioned the master cylinder right in the back here. It is a nice composite master cylinder. It's very durable and efficient. It is a glass-reinforced nylon construction, which will resist rust and corrosion.And it is a very large reservoir, so provides increased capacity for your brake fluid. If you notice at the top, it has a nice automotive style diaphragm cap, that'll create a completely enclosed system, to help prevent contamination of your brake fluid. It does come with the breakaway cable and the latch hook right here you can see it is included. This breakaway cable is required by law. And what this breakaway cable does, is you'll take this hook and latch it to your tow vehicle. And what it prevents is a trailer runaway situation. So if by chance your trailer ever gets disconnected, you make sure this is hooked up. What it'll do is pull on this cable, which will move that latch, which will again, apply pressure in the master cylinder, and it will put brakes on the trailer to prevent a runaway situation. So it is included.This is a weld-on installation and it is made in the USA. Application again is for trailers with hydraulic drum brakes. Gross towing weight capacity is 8,000 pounds. Maximum tongue weight is 800 pounds. The channel width is the inside with. So if we take a ruler and we go inside, the inside is right at three inches. Channel height we mentioned is eight inches. And this is designed to mount to a three-inch-wide trailer tongue. Model number on this goes by DA91. But that should do it for the review on this Demco eight inch adjustable Channel-Down Hydraulic Drum Brake actuator, with the manual lockout and an 8,000 pound weight capacity.


Customer Reviews

Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs - DM8759933

Average Customer Rating:  4.8 out of 5 stars   (4 Customer Reviews)

Surge actuator has a corrosion-resistant composite master cylinder. Manual lockout keeps brakes from actuating when in reverse. Mount coupler attachments (sold separately) in 1 of 3 positions on channel. Weld-on application.

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Ask the Experts about this Demco Brake Actuator

  • Which Ball Mounts/Accessories Fit Demco Hydraulic Brake Actuator with Adjustable Channel
    The bracket on the end of Demco actuator # DM8759933 is 3 inches wide so you would need to look at accessories that mount to a 3 inch wide or 2-7/8 inch wide opening such as Pro Series coupler # PSA200S0303 or Bulldog coupler # BDA200C0317. These are rated for 8,000 pounds to match the Demco actuator. I have also included a link to all of the channel mount couplers you could use. You can also use lunette ring # DM09557-95, 2-tang clevis # DM05593-97, and pintle/ball hitch # C45920 which...
    view full answer...
  • Will Demco Solenoid Kit DM 5404 work with Demco Hydraulic Actuator DM8759933
    The Demco Solenoid Kit for Brake Actuators with Reverse Lockouts # DM5404 is designed to work with DA10, DA20, and DA91 model Demco hydraulic brake actuators. This kit will work with the Demco Hydraulic Brake Actuator # DM8759933 as it is a model DA91 Demco hydraulic actuator.
    view full answer...
  • Replacement Components For A Damaged Demco DA91Coupler
    Yes the internal components for the Demco Hydraulic Brake Actuator - Drum - Primed - 12" Adjustable Channel Down - 8,000 lbs Item # DM8759432 are the same as your current DA91 coupler. We only offer two with the manual lockout with the adjustable channel but not the adjustable channel down. One is the Demco Hydraulic Brake Actuator w/ Manual Lockout - Primed - 8" Adjustable Channel - 8,000 lbs Item # DM8759933 and the other is Demco Hydraulic Brake Actuator w/ Manual Lockout - Drum - Zinc...
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Installed by:
Jeff D
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B

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